Merge pull request #4301 from filecoin-project/steb/fix-two-races

Fix two races

chain/sync.go

@@ -1726,7 +1726,7 @@ func VerifyElectionPoStVRF(ctx context.Context, worker address.Address, rand []b
 	return gen.VerifyVRF(ctx, worker, rand, evrf)
 }
 
-func (syncer *Syncer) State() []SyncerState {
+func (syncer *Syncer) State() []SyncerStateSnapshot {
 	return syncer.syncmgr.State()
 }
 

chain/sync_manager.go

@@ -38,7 +38,7 @@ type SyncManager interface {
 	SetPeerHead(ctx context.Context, p peer.ID, ts *types.TipSet)
 
 	// State retrieves the state of the sync workers.
-	State() []SyncerState
+	State() []SyncerStateSnapshot
 }
 
 type syncManager struct {
@@ -79,7 +79,7 @@ type syncResult struct {
 const syncWorkerCount = 3
 
 func NewSyncManager(sync SyncFunc) SyncManager {
-	return &syncManager{
+	sm := &syncManager{
 		bspThresh:       1,
 		peerHeads:       make(map[peer.ID]*types.TipSet),
 		syncTargets:     make(chan *types.TipSet),
@@ -90,6 +90,10 @@ func NewSyncManager(sync SyncFunc) SyncManager {
 		doSync:          sync,
 		stop:            make(chan struct{}),
 	}
+	for i := range sm.syncStates {
+		sm.syncStates[i] = new(SyncerState)
+	}
+	return sm
 }
 
 func (sm *syncManager) Start() {
@@ -128,8 +132,8 @@ func (sm *syncManager) SetPeerHead(ctx context.Context, p peer.ID, ts *types.Tip
 	sm.incomingTipSets <- ts
 }
 
-func (sm *syncManager) State() []SyncerState {
-	ret := make([]SyncerState, 0, len(sm.syncStates))
+func (sm *syncManager) State() []SyncerStateSnapshot {
+	ret := make([]SyncerStateSnapshot, 0, len(sm.syncStates))
 	for _, s := range sm.syncStates {
 		ret = append(ret, s.Snapshot())
 	}
@@ -405,8 +409,7 @@ func (sm *syncManager) scheduleWorkSent() {
 }
 
 func (sm *syncManager) syncWorker(id int) {
-	ss := &SyncerState{}
-	sm.syncStates[id] = ss
+	ss := sm.syncStates[id]
 	for {
 		select {
 		case ts, ok := <-sm.syncTargets:

chain/syncstate.go

@@ -11,8 +11,7 @@ import (
 	"github.com/filecoin-project/lotus/chain/types"
 )
 
-type SyncerState struct {
-	lk      sync.Mutex
+type SyncerStateSnapshot struct {
 	Target  *types.TipSet
 	Base    *types.TipSet
 	Stage   api.SyncStateStage
@@ -22,16 +21,21 @@ type SyncerState struct {
 	End     time.Time
 }
 
+type SyncerState struct {
+	lk   sync.Mutex
+	data SyncerStateSnapshot
+}
+
 func (ss *SyncerState) SetStage(v api.SyncStateStage) {
 	if ss == nil {
 		return
 	}
 
 	ss.lk.Lock()
 	defer ss.lk.Unlock()
-	ss.Stage = v
+	ss.data.Stage = v
 	if v == api.StageSyncComplete {
-		ss.End = build.Clock.Now()
+		ss.data.End = build.Clock.Now()
 	}
 }
 
@@ -42,13 +46,13 @@ func (ss *SyncerState) Init(base, target *types.TipSet) {
 
 	ss.lk.Lock()
 	defer ss.lk.Unlock()
-	ss.Target = target
-	ss.Base = base
-	ss.Stage = api.StageHeaders
-	ss.Height = 0
-	ss.Message = ""
-	ss.Start = build.Clock.Now()
-	ss.End = time.Time{}
+	ss.data.Target = target
+	ss.data.Base = base
+	ss.data.Stage = api.StageHeaders
+	ss.data.Height = 0
+	ss.data.Message = ""
+	ss.data.Start = build.Clock.Now()
+	ss.data.End = time.Time{}
 }
 
 func (ss *SyncerState) SetHeight(h abi.ChainEpoch) {
@@ -58,7 +62,7 @@ func (ss *SyncerState) SetHeight(h abi.ChainEpoch) {
 
 	ss.lk.Lock()
 	defer ss.lk.Unlock()
-	ss.Height = h
+	ss.data.Height = h
 }
 
 func (ss *SyncerState) Error(err error) {
@@ -68,21 +72,13 @@ func (ss *SyncerState) Error(err error) {
 
 	ss.lk.Lock()
 	defer ss.lk.Unlock()
-	ss.Message = err.Error()
-	ss.Stage = api.StageSyncErrored
-	ss.End = build.Clock.Now()
+	ss.data.Message = err.Error()
+	ss.data.Stage = api.StageSyncErrored
+	ss.data.End = build.Clock.Now()
 }
 
-func (ss *SyncerState) Snapshot() SyncerState {
+func (ss *SyncerState) Snapshot() SyncerStateSnapshot {
 	ss.lk.Lock()
 	defer ss.lk.Unlock()
-	return SyncerState{
-		Base:    ss.Base,
-		Target:  ss.Target,
-		Stage:   ss.Stage,
-		Height:  ss.Height,
-		Message: ss.Message,
-		Start:   ss.Start,
-		End:     ss.End,
-	}
+	return ss.data
 }

node/modules/services.go

@@ -42,11 +42,13 @@ func RunHello(mctx helpers.MetricsCtx, lc fx.Lifecycle, h host.Host, svc *hello.
 		return xerrors.Errorf("failed to subscribe to event bus: %w", err)
 	}
 
+	ctx := helpers.LifecycleCtx(mctx, lc)
+
 	go func() {
 		for evt := range sub.Out() {
 			pic := evt.(event.EvtPeerIdentificationCompleted)
 			go func() {
-				if err := svc.SayHello(helpers.LifecycleCtx(mctx, lc), pic.Peer); err != nil {
+				if err := svc.SayHello(ctx, pic.Peer); err != nil {
 					protos, _ := h.Peerstore().GetProtocols(pic.Peer)
 					agent, _ := h.Peerstore().Get(pic.Peer, "AgentVersion")
 					if protosContains(protos, hello.ProtocolID) {